In 2018, 80% of US citizens were not meeting CDC physical fitness guidelines, which suggests:

• A. 10-15 minutes of aerobic activity per day
• B. 150-300 minutes of aerobic activity per day
• C. 150-300 minutes of aerobic activity per week
• D. 300-500 minutes of aerobic activity per week

Answer: (C)

The concept being tested is the weekly amount of aerobic activity recommended for adults by the CDC. The standard guideline is 150 to 300 minutes of moderate‑intensity aerobic activity per week, with additional health benefits if you approach the upper end. This is why the statement about 150-300 minutes per week is the best fit.

Why this fits: 150 minutes per week is the minimum to gain meaningful health benefits, and up to 300 minutes per week provides even greater benefit. Examples of moderate-intensity activity include brisk walking, cycling at a casual pace, or swimming at a comfortable pace. The other options miss the weekly framing or set targets that are either too low (A, 10-15 minutes daily totals well under 150 weekly) or too high or misframed (B implies the higher amount per day, D starts at 300 per week but gives a range that exceeds typical recommendations).